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authorChen Gang <gang.chen.5i5j@gmail.com>2014-11-02 10:13:11 +0800
committerChris Metcalf <cmetcalf@tilera.com>2014-11-04 10:38:10 -0500
commit01f7ae056916b4e75ccaa48b9daacb9806caf4aa (patch)
tree9cf1b797c508389f465b9663eb60c0f5d2a7a8b9 /lib/earlycpio.c
parent0df1f2487d2f0d04703f142813d53615d62a1da4 (diff)
arch: tile: kernel: signal.c: Use __copy_from/to_user() instead of __get/put_user()
setup/restore_sigcontext() want to copy all related registers between user and kernel. So use block copy instead of each registers copy. Then can let code simple and clearer (which can avoid compiler's warning): The related warning (with allmodconfig under tile): CC arch/tile/kernel/signal.o In file included from include/linux/poll.h:11:0, from include/linux/ring_buffer.h:7, from include/linux/ftrace_event.h:5, from include/trace/syscall.h:6, from include/linux/syscalls.h:81, from arch/tile/kernel/signal.c:30: arch/tile/kernel/signal.c: In function 'setup_sigcontext': arch/tile/kernel/signal.c:116:31: warning: iteration 53u invokes undefined behavior [-Waggressive-loop-optimizations] err |= __put_user(regs->regs[i], &sc->gregs[i]); ^ ./arch/tile/include/asm/uaccess.h:236:26: note: in definition of macro '__put_user_asm' : "r" (ptr), "r" (x), "i" (-EFAULT)) ^ ./arch/tile/include/asm/uaccess.h:297:10: note: in expansion of macro '__put_user_8' case 8: __put_user_8(x, ptr, __ret); break; \ ^ arch/tile/kernel/signal.c:116:10: note: in expansion of macro '__put_user' err |= __put_user(regs->regs[i], &sc->gregs[i]); ^ arch/tile/kernel/signal.c:115:2: note: containing loop for (i = 0; i < sizeof(struct pt_regs)/sizeof(long); ++i) ^ Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com> Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Diffstat (limited to 'lib/earlycpio.c')
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